Impact of Aggregating Devices on Cuttlefish fishery

Sasikumar, Geetha and Dineshbabu, A P and Rajesh, K M and Sulochanan, Bindu and Swathi Lekshmi, P S and Thomas, Sujitha and Rohit, Prathibha (2013) Impact of Aggregating Devices on Cuttlefish fishery. In: Awareness program on the ‘Impact of the aggregating devices on cuttlefish fishery’, 5 - 7 December, 2013 Mangalore, Mangalore.


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    The Class Cephalopoda comprising of squids, cuttlefishes and octopus includes the largest known living invertebrates within the animal Kingdom. Cephalopods have well developed head and a body consisting of a muscular mantle and mantle cavity. Head bears circumoral appendages (arms, tentacles), a feature that reflects the origin of the name ‘Cephalopoda’, which is derived from the union of the two Greek words: ‘kefale’, head, and ‘pous’, feet. These soft-bodied bilaterally symmetrical groups are commercially important fishery resources occurring in all marine habitats in depth ranging from intertidal to over 5,000 m. Salinity is considered as the limiting factor restricting their distribution between 27 and 37 psu, with few exceptions. The cuttlefishes belonging to the family Sepiidae are of significant commercial value to artisanal and industrial fisheries. Cuttlefishes are primarily bottom-dwellers over a range of habitats, including rocky, sandy, and muddy substrates, seagrass, seaweed and coral reefs. They are slower swimmers than the more streamlined squids. Cuttlefishes are able to attain neutral buoyancy by regulating the relative amounts of gas and fluid in the chambers of the cuttlebone, and they are able to hover in midwater, with fins acting as stabilizers. Large species such as Sepia latimanus, S. officinalis and S. pharaonis are restricted to much shallower depths and show very different septal spacing and sutures than the deeper water species. Some species migrate seasonally in response to temperature changes and aggregate, usually in shallow water, at spawning time. Cuttlefishes have broad sac-like bodies with lateral fins that are narrow and extend along the length of the mantle; posterior lobes of the fins free (subterminal) and separated by the posterior end of the mantle; 10 circumoral appendages, the longest 2 (tentacles) are retractile into pockets on the ventrolateral sides of the head; the 8 remaining arms frequently with 4 series of stalked suckers with chitinous rings; eyes are covered with a transparent membrane and eyelids are present. They are characterized by the presence of a dorsally placed internal calcareous shell known as the cuttlebone, which is a finely chambered shell, thick, and chalky.

    Item Type: Conference or Workshop Item (Paper)
    Uncontrolled Keywords: Aggregating Devices; Cuttlefish fishery; Cephalopods
    Subjects: Molluscan Fisheries > Cephalopods
    Divisions: CMFRI-Mangalore
    Depositing User: Arun Surendran
    Date Deposited: 11 Feb 2014 05:05
    Last Modified: 09 Sep 2015 15:57

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